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Regulation of a membrane-bound proteinase in mammalian cells
J S Bond1, P E Butler, G Macadam
1Department of Biochemistry & Nutrition, State University, Blacksburg 24061-0308.
Abstract:
Cellular proteolytic enzymes are regulated by multiple mechanisms that affect gene expression, enzyme concentration, and enzyme activity. The expression of the membrane-bound metallo-endopeptidase, meprin, in different mammalian species, strains, tissues and cell types is highly variable. Meprin is exclusively localized to the plasma membrane, and this determines the types of substrates the enzyme will encounter and the microenvironment for activity. Recent studies have revealed an inactive form of a meprin-like proteinase that can be activated in vitro by proteases, and this raises the possibility of regulation of enzyme activity at the cell surface in response to environmental stimuli. In this chapter, the current knowledge about meprin, and the meprin-like inactive forms in mouse kidney is discussed.
Insights
Meprin, a membrane-bound enzyme, shows variable expression and activity regulation. Research explores its inactive forms and cell surface activation in mouse kidneys.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Cellular proteolytic enzymes are regulated by diverse mechanisms impacting gene expression, concentration, and activity.
- Meprin, a membrane-bound metallo-endopeptidase, exhibits significant variability in expression across species, strains, tissues, and cell types.
- Meprin's plasma membrane localization dictates substrate interaction and its microenvironment for activity.
Purpose of the Study:
- To discuss current knowledge on meprin and its inactive forms in the mouse kidney.
- To explore the implications of protease-activated inactive meprin-like proteinases for cell surface regulation.
Main Methods:
- Literature review and synthesis of existing research on meprin.
- Analysis of studies investigating meprin expression and localization.
- Examination of findings related to inactive meprin-like proteinases and their activation.
Main Results:
- Meprin expression is highly variable and its localization to the plasma membrane is crucial for its function.
- An inactive form of a meprin-like proteinase has been identified, suggesting potential regulation of activity.
- Activation of this inactive form by proteases in vitro indicates a possible mechanism for cell surface enzyme regulation.
Conclusions:
- Meprin and its inactive forms in the mouse kidney are subject to complex regulatory mechanisms.
- The discovery of activatable inactive forms suggests a dynamic regulation of meprin activity at the cell surface.
- Further research is warranted to fully elucidate the physiological roles and regulatory pathways of meprin and related proteinases.